If you ever have any left over "old" glow fuel, save it!

It is great for exactly this situation.

After a crash I will brush any dirt from the engine with the carb pointed down.

I take the plane home and remove the engine.

I pull off the carb and glow plug, and w/o turning the piston I repeatedly flush the crankcase with the old glow fuel.

I then remove the backplate and flush with glow fuel again.

I then spray the area with WD-40 and again with glow fuel all over.

Finally I will LIGHTLY turn the crankshaft. If I feel even the hint of grinding or resistance at this point, I stop and disassemble the whole thing.

If not I turn the crankshaft over dropping the piston and again spray and flush to get out any debris.

If after repeated cleanings I feel no resistance ( scoring ), I'll wash the carb in warm water, followed by a WD-40 spray, and then glow fuel...

I dry and clean all of the nipples, etc. with pressurized air.

Thus far I've not had to go as far as pulling the cylinder or bearings and the engines have run reliably.